The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Average Weight Finder — Discover Your Healthy Weight Range
Finding your ideal body weight starts with understanding the healthy weight range for your height. In the UK, the NHS uses BMI (body mass index) to define healthy weight, which falls between 18.5 and 24.9 for most adults. Rather than aiming for a single "average" number, it's more useful to identify the range of weights that support your individual health. Your healthy weight depends on your height, age, and body composition — not just what others weigh. Our free BMI calculator helps you discover whether your current weight falls within the healthy range for your height, and the weight converter makes it easy to check across kg, stone, and pounds.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Healthy Weight Range by Height — BMI-Based Guide
A healthy weight range is defined by a BMI between 18.5 and 24.9 according to NHS guidelines. To find your ideal weight range for your specific height, multiply your height (in metres, squared) by 18.5 for the lower bound and 24.9 for the upper bound. For example, if you are 5ft 7in (1.70m), your healthy weight range is approximately 53–71 kg (8st 5lbs to 11st 2lbs). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends a slightly lower healthy weight range — between 18.5 and 22.9 — because these groups face higher health risks at the same BMI.
- Height 5ft 4in (163cm): Healthy range approximately 49–67 kg (7st 10lbs to 10st 6lbs)
- Height 5ft 6in (168cm): Healthy range approximately 52–71 kg (8st 3lbs to 11st 2lbs)
- Height 5ft 8in (173cm): Healthy range approximately 55–74 kg (8st 9lbs to 11st 8lbs)
- Height 5ft 10in (178cm): Healthy range approximately 59–79 kg (9st 3lbs to 12st 6lbs)
Remember that these ranges represent healthy weights; your ideal weight within that range depends on factors like muscle mass, frame size, and overall fitness. The NHS healthy weight calculator provides personalised results based on your exact measurements.
Clinically BackedWeight Loss
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
How to Use BMI to Find Your Ideal Weight
BMI is a useful screening tool, but it has important limitations — it doesn't distinguish between muscle and fat, so athletes may have a high BMI despite low body fat. Waist circumference is also important: men with a waist over 94cm (37in) and women over 80cm (31.5in) have increased health risk, even at a healthy BMI. Use our free BMI calculator above to check your personal BMI instantly and see how your weight compares to the NHS healthy range for your height. The weight converter tool on this page makes it simple to switch between kg, stone, and pounds. If you're tracking weight changes over time, our free progress tracker lets you log your measurements and visualise trends in your healthy weight journey.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What is the average weight for a UK adult?
The average UK adult man weighs approximately 85.7 kg (13st 7lbs) and the average woman weighs 71.6 kg (11st 3lbs). However, "average" is not the same as "healthy" — many UK adults are overweight. Your ideal weight depends on your height, not on population averages.
How do I calculate my healthy weight range?
Multiply your height in metres (squared) by 18.5 for the lower healthy BMI, and by 24.9 for the upper limit. For example, at 1.70m tall: (1.70 × 1.70) × 18.5 = 53kg and (1.70 × 1.70) × 24.9 = 72kg. The BMI calculator on this page does this automatically.
Is BMI accurate for everyone?
BMI is a useful screening tool but has limitations. It doesn't account for muscle mass (athletes may have high BMI with low body fat) or fat distribution. Waist circumference is also important — ask your GP for personalised advice about your healthy weight.
What is the healthy weight range for 5ft 6in?
At 5ft 6in (168cm), a healthy BMI of 18.5–24.9 corresponds to a weight of approximately 52–71 kg (8st 3lbs to 11st 2lbs). Use our free weight converter to switch between kg and stone instantly.
Should I aim for a specific weight or a range?
Aim for the healthy weight range for your height rather than a single number. Your ideal weight within that range depends on factors like frame size and muscle mass. The NHS recommends consulting your GP for personalised guidance on what's healthy for you.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.